Patent GB-189707976-A (GB)
Title: Improvements in Machines for the Manufacture of Wood Screws.
Inventor: SLOAN THOMAS JAMES
Filed: 1897-03-27
Granted: 1898-02-05
Abstract: 7976. Sloan, T. J. Aug. 29, A.D. 1896, [date claimed under Sec. 103 of Patents &c. Act, A.D. 1883]. Wood - screws, m a k i n g. Fig. 1 shows the machine which first turns the heads of the blanks, then nicks them, then turns the heads again to remove the burr, next points, and lastly threads the blanks. The blank is held vertically by rotary grippers and is carried from one p a i r of grippers to another by a distributer arm. The blanks are taken from a shoot k by the distributer arm e fixed to a horizontal arm which can be rotated on its axis by a rack g and sector f<1>, and can be slid in the direction of its axis by a lever. The arm e has two jaws so that by a slight movement a blank can be inserted between a pair of grippers and a blank just operated upon removed therefrom. A blank is thus inserted in the jaws n<3>, n<4> upon arms which are operated by the rod r and closed by the rollers p on the spring sleeve o operated by the cross-bar s on the rod r itself worked by the lever 9. While held in these jaws of the gripper l<1> the blank is pushed upwards into position by a rod 12 actuated by the rod 14 and cam 15. The same rod carries a wedge which forces the backstay 16 into position against the blank while it is being operated upon by the heading-cutter w on the pivoted arm w<1>. The cutter is gradually advanced by the rod w<3> on a sleeve w<4> actuated by the arm 19 and cam 20. The gripper is rotated by the wheels t, t<1>, t<2> and shaft t<3>. The wheel t is connected to the gripper by springs to avoid shock. The gripper is held fixed by the pointed end of the cam-actuated rod 1 which enters a notch in the gripper. The positions of the grippers l<1>, l<2> are now interchanged by the rotation of the shaft v carrying the grippers by arms u, u, the wheel t<1> at the same time being allowed to move aside by the rod 1 which engages a lever 7 carrying a hook engaging the axle of the wheel t'. The shaft v above mentioned is fixed to a slotted disc y turned by a pin on the wheel z fixed to the cam shaft d. The blank is now held stationary while nicked by the saw x rotated by worm gearing. The saw is advanced by a rod 21 and lever 22. The position of the grippers are again interchanged and the burr is removed by the heading-tool w. The arm e now takes the blank and swinging through 180‹ introduces it to the jaws 29 of one of a series (say six) of grippers which rotate and revolve. The jaws are opened and closed by a spring-actuated rod 25, operated by a lever 40. The grippers are rotated by wheels 42 gearing with a central wheel 43 on a shaft 44 connected to the main shaft by bevel gears. The grippers are revolved by a large wheel 32 in which all the grippers have a bearing. This wheel 32 gears with a wheel 33 on the shaft 34 carrying a slotted disc moved like the disc y. The grippers are held stationary by a cam-actuated lever 37, 38. The blank is next pointed by a cutter 47 fixed to a rod 50 which is drawn down by a lever 52 and cam 53 so as to traverse the cutter. The cutter is simultaneously moved inwards to form the conical point by an incline acting on an arm on the rod 50. The screw - threading is effected by cutters fixed to arms 57 on vertical spring-actuated sleeves all attached to a ring 59. The cutters are traversed along the blank by pulling down the ring 59 by means of rods 60 and the shaft 62 carrying the leading screw 65 bearing against the half nut 66 intermittently put into action by the cam 67. The sliding shaft 62 is connected by a feather to the sleeve 64 of the constantly-rotating bevel-wheel 45. The threading cutters are fed inwards as they descend by a fixed incline against which the cutter levers 57 bear. They are also fed inwards to deepen the thread by vertical wedges all carried by the ring 77 connected by arms to the piece 79 moved by the lever 80. The backstays 83 are carried by pivoted levers and are forced into action by wedges, a ring 86, and lever 88 in a similar way. The distributer arm delivers the finishedscrew to the shoot 90.